CVE-2026-42208

CRITICAL CISA KEV EPSS 99.6%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
9.3 CVSS 4.0
Critical
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
KEV Listed May 8, 2026 1mo ago
KEV Due May 11, 2026 50d overdue

Description

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.81.16 to before version 1.83.7, a database query used during proxy API key checks mixed the caller-supplied key value into the query text instead of passing it as a separate parameter. An unauthenticated attacker could send a specially crafted Authorization header to any LLM API route (for example POST /chat/completions) and reach this query through the proxy's error-handling path. An attacker could read data from the proxy's database and may be able to modify it, leading to unauthorised access to the proxy and the credentials it manages. This issue has been patched in version 1.83.7.

CVSS Details

Base Score
9.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

CISA Known Exploited Overdue 50d
Added
May 8, 2026
Due
May 11, 2026

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

EPSS Exploit Probability
99.6% percentile
Exploit & Patch Status
Actively Exploited (KEV)
Patch Available

Weaknesses 1

CWE-89 SQL Injection Injection

Affected Products 1

VendorProductVersionRange
litellmlitellm*≥1.81.16  –  <1.83.7

References 3

  • github.com https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
    ProductRelease Notes
  • github.com https://github.com/BerriAI/litellm/security/advisories/GHSA-r75f-5x8p-qvmc
    MitigationPatchVendor Advisory
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42208
    US Government Resource

Remediation

  • github.com https://github.com/BerriAI/litellm/security/advisories/GHSA-r75f-5x8p-qvmc
    MitigationPatchVendor Advisory